Re: VFO/BFO selecting outputs
Well, got the coax attached and all I
get is birdies, no RX. Not sure why. I can see the BFO clk
running. I removed the xtal and attached the coax as in here:
/g/BITX20/topic/4703461#24270
I didn't make any other changes to the code, which I may need to
for LSB/USB operation. Unfortunately I ran out of time and have to
take off for mt 48 hour work shift, so I won't be able to dig into
it until Wednesday aft. Any suggestions as to where to look?
Thanks!
Jonathan
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Good!
I had borrowed that code from Farhan's original script, which
compiles with the older etherkit library.
All three of the lines of code I gave you should either
reference CLK0 or CLK2, I gave you a mix. ?The Raduino with
cabling as delivered and described in the Wireup uses CLK2 for
the VFO. ?So I'd guess most people will want to use CLK0 for the
BFO.
On Sun, Apr 9, 2017 at 01:46 pm, Jonathan Peakall wrote:
Got CLK2 going!
?
_.
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Re: Birdie at 7199 - a surprising observation!
Here is a picture at the output of Si5351 not connected to a mixer, just terminated with 51R resistor. This happens when the output is different from 25MH. Only CLK0 is enabled. Quartz at 27MHz. The spurious "needles" in the spectrum appear to be related as follows:
And apparently these are not the harmonics of the fundamental VFO frequency. This is rather disturbing because they appear blow and above the fundamental. No wonder I have numerous birdies. Suspiciously 25 MHz is 800 MHz (PLL) divided by 32...
I wonder if decoupling the different supply pins of Si5351 might help. Another thing I might tryis to buffer the CLK0 with a fast logic gate with separate low noise power supply.
73 de LZ1NEF
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It's got both, it's currently set to to shuttle tuning as per Don's which i actually think is more useful because it doesn't jump about. If you want Farhan's original just change the line in loop() to doTuning() rather than doShuttleTuning().
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Re: Birdie at 7199 - a surprising observation!
Just a suggestion: I found that the drive current line in my Raduino was commented out.? I removed the comment slashes and compiled with the current set a 2 MA.
I also replaced the two wires that carry the VFO signal from the Raduino to the board with a short length of RG-174U coax and the birdie is now completely gone.? Not sure which change killed it at this point.
Kevin
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Ok, I figured it out for those that are having trouble. ?Open the main BitXtra40 file. ?Then open a new tab in the Arduino IDE paste the information from the UpsideDown file into that new tab. ?Then compile. ?There may be a different way to open both files in the same IDE environment, but this is how I got it to work.
Question for you Andrew -?
I havent uploaded this sketch yet, but I probably will tonight. ?Does this have the tuner like Don had, or like Farhan designed? ?
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On Mon, Apr 10, 2017 at 04:03 am, Raj vu2zap wrote: Remove R1 hi Raj, Thanks a lot! I see removing the R1 should do the trick.? have a nice day. vy 73's hanz de PA3ZZ
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I too made the "rookie" mistake. And by using the RS electret capsule, may have compounded the problem further. I did have my base rig antenna disconnected but there was still the ambient noise thing. Originally I had no audio, which led me to replacing my mic wiring back from the board and the electret. Went back to the original (which was still ok) and even in close proximity the audio sounded better, if not great. Will try the web sdr later. Still would like to know the original electret capsule spec. Anyone? Thanks to all
Sent from Mike's iPad WA1MAD
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Hans, you will need to rewire the mic.
Remove R1
Connect mic -ve to ground
wire PTT button to ground and other end to data pin use that pin for
PTT
You will need a 4pin socket.
At 10-04-2017, you wrote:
Hi,
Does any one have experiance with connecting a handmic like this one
mh-34b4b ?
The ptt doesn't switch in the bitx, led on mic is lit. With the switch
delivered with the bitx the ptt works fine.
I tried the mic with the test circuit (led and resistor and it switches
the led on and of).
Any one an idea?
73's
hanz de PA3ZZ
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Hi, Does any one have experiance with connecting a handmic like this one?mh-34b4b ? The ptt doesn't switch in the bitx, led on mic is lit. With the switch delivered with the bitx the ptt works fine. I tried the mic with the test circuit (led and resistor and it switches the led on and of). Any one an idea? 73's hanz de PA3ZZ
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Hi Sarma I will try ...TKS
73 de py2ohh miguel
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You'll need both .ino files in your project. You're missing the upside down sketch which defines printFrequency.
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Re: The Users User Manual
Correction- the alignment instructions have been amended. Turn both controls down clockwise. Turning them up is COUNTERCLOCKWISE. R136 is to the right of the black, round, short, heatsink. This adjustment will ensure you have optimal power output for your rig. And you can turn it down for linear amplifiers. Output reading required. Alignment of the BITX40 The BITX40 comes pre-aligned out of the box. However, it may go out of alignment for some reason and here are the steps to align it. Keep the circuit handy while you do it. If you can't understand what it means to 'insert the ammeter into the power line' ask someone for help. 
- Attach a dummy load to the antenna
- Insert a ammeter (you may use your VOM meter in high amps range) into the PA power supply's positive line
- Keep the PA BIAS preset (RV1) to fully clockwise position. Now when you press the PTT button, the ammeter should read about zero.
- Increase PA BIAS without speaking into the mic until the PA current shows 100 ma
- Give a loud and long HAAAALLLOOWW into the mic and the current should jump to slightly over 1 amp
- Adjust the RV136 to increase the PA drive if the current doesn't jump all the way to 1A
- Keep monitoring your signal on a nearby receiver.
<>Note: You may use the RV136 to reduce the output power to drive an external linear or go QRPp. You should check the power settings with the multimeter, if and when you decide to use 24 volts.?Small adjustments may need to be made.
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Re: Birdie at 7199 - a surprising observation!
To: N7PXY Ash has just recently uploaded the Bitx40.ino file used in the shipped product. You should get this and upload it to your Raduino and make sure you still have Etherkit 2.0.1 library installed. This should be a factory reset. You can find and try changing a line of code to try and scare away the birdie later. Which is on line # 598. Here is the github link for Ashar Farhan's working sketch-?https://github.com/afarhan/bitx40
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fellow coders,
what follows is gibberish to those who do not use git to control their source code. ignore please.
i am pushed the production bitx40.ino to the repository. it is not raduino.ino, but bitx40.ino. ?i have a few pull requests pending, but before that, i would request you to merge into the small bits that were already fixed in the main.
following this, i will pull from you all.
- f
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hi ,
?please try to use TL074 instead for lower noise level than TLo84. regards ?sarma ?vu3zmv
On Sun, Apr 9, 2017 at 11:54 PM, Miguel Angelo Bartie via Groups.Io <py2ohh@...> wrote: Hi Farhan and friends
The link for the HF phase RX is ; I build also one phase transmitter ...using the same modules in? an inverted? way ...I will try to build a transceiver.... The main tip was? an All Pass Band Pass Filter ... using a TL084 ... made with QuadNet software looking for More than 40dB supression and ease to find parts. the link is : This all pass filter is for 300Hz to 3kHz ...and I use a band pass filter ... another TL084 : link The final results in a better supression than 40dB .... another aplications is to transform a SDR receiver in one Rx who dont need a PC ...link 73 from py2ohh miguel
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Re: shipping options, raduino, source code and website updates
College Professor Simon Thompson
I like and appreciate the term “comrades”.
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On Apr 9, 2017, at 12:14 AM, Ashhar Farhan < farhanbox@...> wrote:
comrades,
i have a few updates to tell you guys
1. hfsigs will now ship through DHL. that means you will get your radio within a week with full tracking. this costs $10 extra. if you want to save, the old shipping option is available too. gives you both options.
2. raduino is now available to be bought separately at $25. i have a number of raduino based projects that will bring online soon. if you dabble with other arduino projects or use the Si53551 in any other radios, this might be an excellent idea : it allows you to write your own code to do whatever you want it to.
3. the mystery of the bullet 5 in the bitx40 alignment is solved. instead of closing the </li> i had typed <li>. i have fixed it. many thought that that's where he elusive RV136 was explained. that is now fixed too. the station 10-1/2 is now in plain sight.
4. i have synced the bitx40 source code to what is being shipped on github.
- f
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Re: shipping options, raduino, source code and website updates
Dear Mr. Farhan, Thank you for taking the trouble to help me. Thank you for extending compassion and flexibility when I needed it.
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I was a few things. The first rookie mistake was setting the receiver to a certain freq, and the BITX to the same and transmitting. The raduino was a few hundred Hz off and not calibrated yet. The close proximity of the receiver, received the signal much better than a distant one would have, sounding kinda weak and kinda fuzzy. I used the receiver like this before getting the BITX and knew to collapse the antenna, and turn off DX so as not to overload the front end signal amplifier. Searching for TX signal clued me in that I was a bit off intended freq. Assimilating a calibration fix has been nice. I only used it once so far. I also replaced the original mic capsule which improved the fuzzy oscillation sound a bit more. It did sound a little bit fuzzy and weaker on WebSDR with original mic. I don't know the specs on it. It came from a broken "The Clapper" wall switch, and is the same size. So the short answer is yes, it was too close.?
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Every Arduino program must have a?setup() and loop() function. The?setup() function?is used to set the environment in which the program runs. It only runs one time when the program first begins to run. When your code in setup() finishes execution, program control immediate begins to execute the code you wrote for the loop() function. The code in the loop() function runs until: 1) power is removed, 2) your perform a reset, or 3) there is some kind of component or other failure.
Functions you write are called as part of the loop() function. The exception are Interrupt Service Routines which get called as needed, depending upon how you set them up.?
If all of this seems strange to you, print out the Raduino code, look for setup() and loop(), and see if you can follow what's going on. If you have your ham license and can still fog a mirror, I know you can learn to program an Arduino. It just takes a little time and practice.
Jack, W8TEE
From: Mark via Groups.Io <mark2w0jmk@...>
To: [email protected]
Sent: Sunday, April 9, 2017 3:51 PM
Subject: Re: [BITX20] Bitx-40 S meter
Thank you Jack but that went right over my head. I did try to add pinMode(A2, INPUT); To where I thought was the setup but had a load of errors straight away. Like I said I'm not one for this programming lark.
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So how did that get resolved? ?I assume that SW receiver was just too darn close. Jerry
On Sun, Apr 9, 2017 at 03:13 pm, John Smith wrote: On my SW receiver it sounded like I was talking into a fan. ?
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Raj vu2zap